Urbanized Areas Index
In this CJ, you will often read about the showcased city's ranking on the UAI. This post is meant to explain that a little further. It will also be permanently added as a side block on this CJ for easy reference.
The Urbanized Areas Index, or UAI is a tiered listing system for developed areas.
Tier 1 - Tier 1 cities are metropolises with a population of 1 million or more. They are cities important on a global scale and are cultural and economic juggernauts. (ex. New York City, Chicago)
Tier 2 - Tier 2 cities usually have a population of 100,000 to 1 million and are major metropolitan areas. They are anchor cities in a regional and national scale economies. (ex St. Louis, Nashville)
Tier 3 - These cities usually have a population of 50,000 to 100,000 and are key cities of a metropolitan area. They are often anchor cities to a state's economy. (ex. Peoria, Illinois, Rochester, MN)
Tier 4 - Tier 4 cities have a population of 20,000 to 50,000 and do not have a metropolitan area. They are fairly unimportant economically outside of their immediate area.
Tier 5 - Tier 5 cities have a population under 20,000 and are officially titled "towns". These are the most numerous settlements and where most people in the country call home.
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